Added README

LICENSE.md

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+MIT License
+
+Copyright (c) 2017 Keijiro Takahashi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+Swarm
+=====
+
+**Swarm** is an experimental project that tries to find an interesting way of
+utilizing the [procedural instancing] feature that was newly introduced in
+Unity 5.6.
+
+There are two types of renderers in *Swarm*.
+
+**Swirling Swarm**
+
+![screenshot](http://i.imgur.com/XoOMqTIm.png)
+![screenshot](http://i.imgur.com/NNFsWBDm.png)
+
+*Swirling Swarm* simulates particle motion within a [divergence-free noise
+field] and draws trace lines along it. The simulation is reset in every frame,
+but the noise field keeps moving slowly, so that it gives the impression that
+the swirls are slowly moving around and changing their shapes.
+
+**Crawling Swarm**
+
+![screenshot](http://i.imgur.com/SkIZUAT.gif)
+![screenshot](http://i.imgur.com/tci4x1V.gif)
+
+The basic concept of *Crawling Swarm* is the same to *Swirling Swarm*; it
+simulates particle motion within a noise field, but it's constrained with a
+[distance field volume]. It tries to keep distances between the particles and
+the object surface as low as possible. It gives the feeling that the lines are
+crawling around on the surface and cover it.
+
+[procedural instancing]: https://docs.unity3d.com/ScriptReference/Graphics.DrawMeshInstancedIndirect.html
+[divergence-free noise field]: http://martian-labs.com/martiantoolz/files/DFnoiseR.pdf
+[distance field volume]: https://github.com/keijiro/DFVolume
+
+System Requirements
+-------------------
+
+- Unity 5.6 or later
+
+*Swarm* only runs on the platforms that support [compute shaders] and [GPU
+instancing].
+
+[compute shaders]: https://docs.unity3d.com/Manual/ComputeShaders.html
+[GPU instancing]: https://docs.unity3d.com/Manual/GPUInstancing.html
+
+License
+-------
+
+[MIT](LICENSE.md)